Dakshin Honda — Old Car Purchase Fraud

I sold my old car (Santro Xing XO) to Dakshin Honda - Hosur Road/ Honda Auto Terrace while purchasing a new car in 2018. I have been chasing them to get the paper work/proof for ownership transfer but they are not providing any details and they are saying that they lost the car papers. I am going to file an FIR as a last resort.